Francis Leavenworth discovered NGC 3139 = LM 2-421 and noted "mag 15.60, 0.1', R, 2nd of 2 [with NGC 3138]." His rough position (nearest min of RA) is 0.7 min of RA west of MCG -02-26-034. Not found by Bigourdan.

400/500mm - 17.5" (2/22/03): fairly faint, fairly small, elongated ~4:3 WSW-ENE, 0.7'x0.5', broadly concentrated. Located 10' NE of mag 7.4 SAO 155773.

Notes by Steve Gottlieb